628 lines
22 KiB
Rust
628 lines
22 KiB
Rust
//! Durable Pod-name metadata/state persistence.
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//!
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//! This crate owns the name-keyed Pod state surface under a Pod-state root,
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//! e.g. `{data_dir}/pods/{pod_name}/metadata.json`. Session JSONL replay stays
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//! in `session-store`; Pod metadata may point at a `(SessionId, SegmentId)` but
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//! does not own or replay session logs.
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//!
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//! `resolved_manifest_snapshot` is authority only for Pod-name restore before
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//! loading the session log. Existing segment replay still uses `SegmentStart`
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//! entries from `session-store`. `spawned_children` is durable current parent
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//! Pod state for child registry/reclaim; child lifecycle messages shown to the
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//! model remain session JSONL history. Socket and callback paths are last-known
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//! runtime hints, not proof of liveness.
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use serde::{Deserialize, Serialize};
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use session_store::{SegmentId, SessionId};
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use std::fs;
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use std::path::PathBuf;
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/// Errors from Pod metadata persistence.
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#[derive(Debug, thiserror::Error)]
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pub enum PodStoreError {
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#[error("I/O error: {0}")]
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Io(#[from] std::io::Error),
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#[error("serialization error: {0}")]
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Serde(#[from] serde_json::Error),
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#[error("invalid pod name: {0}")]
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InvalidPodName(String),
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}
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/// Active Session/Segment pointer for a Pod.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodActiveSegmentRef {
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pub session_id: SessionId,
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#[serde(default, skip_serializing_if = "Option::is_none")]
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pub segment_id: Option<SegmentId>,
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}
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impl PodActiveSegmentRef {
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/// Create a reference whose active Segment is not known yet.
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pub fn pending_segment(session_id: SessionId) -> Self {
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Self {
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session_id,
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segment_id: None,
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}
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}
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/// Create a fully resolved active Session/Segment reference.
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pub fn active_segment(session_id: SessionId, segment_id: SegmentId) -> Self {
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Self {
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session_id,
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segment_id: Some(segment_id),
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}
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}
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}
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/// One delegated scope rule for a spawned child, kept local to avoid depending
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/// on manifest scope types in durable Pod state.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodSpawnedScopeRule {
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pub target: PathBuf,
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pub permission: String,
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pub recursive: bool,
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}
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/// One child Pod spawned by this Pod and persisted with the spawner's
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/// name-keyed Pod state. Runtime paths are last-known hints only.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodSpawnedChild {
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pub pod_name: String,
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pub socket_path: PathBuf,
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pub scope_delegated: Vec<PodSpawnedScopeRule>,
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pub callback_address: PathBuf,
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}
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/// One child delegation that has been reclaimed. Kept as durable audit state so
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/// restore can distinguish outstanding delegated scope from already-reclaimed
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/// child state without consulting session logs.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodReclaimedChild {
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pub pod_name: String,
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pub scope_delegated: Vec<PodSpawnedScopeRule>,
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}
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/// One peer Pod made visible by an explicit peer handshake.
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///
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/// Peer visibility is intentionally separate from spawned-child delegation: it
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/// does not carry filesystem scope, callback ownership, output cursors, or
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/// lifecycle-notification authority.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodPeer {
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pub pod_name: String,
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}
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/// Persistent metadata for a Pod name.
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#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
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pub struct PodMetadata {
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pub pod_name: String,
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#[serde(default, skip_serializing_if = "Option::is_none")]
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pub active: Option<PodActiveSegmentRef>,
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#[serde(default, skip_serializing_if = "Vec::is_empty")]
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pub spawned_children: Vec<PodSpawnedChild>,
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#[serde(default, skip_serializing_if = "Vec::is_empty")]
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pub reclaimed_children: Vec<PodReclaimedChild>,
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#[serde(default, skip_serializing_if = "Vec::is_empty")]
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pub peers: Vec<PodPeer>,
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#[serde(default, skip_serializing_if = "Option::is_none")]
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pub resolved_manifest_snapshot: Option<serde_json::Value>,
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}
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impl PodMetadata {
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/// Create Pod metadata for `pod_name`.
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pub fn new(pod_name: impl Into<String>, active: Option<PodActiveSegmentRef>) -> Self {
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Self {
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pod_name: pod_name.into(),
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active,
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spawned_children: Vec::new(),
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reclaimed_children: Vec::new(),
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peers: Vec::new(),
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resolved_manifest_snapshot: None,
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}
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}
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}
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/// Sync persistence backend for Pod metadata.
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pub trait PodMetadataStore: Send + Sync {
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/// Create or replace metadata for its `pod_name` key.
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fn write(&self, metadata: &PodMetadata) -> Result<(), PodStoreError>;
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/// Read metadata by Pod name. Returns `None` when no metadata exists.
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fn read_by_name(&self, pod_name: &str) -> Result<Option<PodMetadata>, PodStoreError>;
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/// List persisted Pod metadata keys.
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fn list_names(&self) -> Result<Vec<String>, PodStoreError>;
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/// Return the metadata root directory when this backend is path-backed.
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fn root_dir(&self) -> Option<PathBuf> {
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None
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}
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/// Delete metadata by Pod name. Missing metadata is a successful no-op.
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fn delete_by_name(&self, pod_name: &str) -> Result<(), PodStoreError>;
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/// Merge an update into one Pod's metadata, preserving unrelated fields.
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fn update_by_name<F>(&self, pod_name: &str, update: F) -> Result<PodMetadata, PodStoreError>
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where
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F: FnOnce(&mut PodMetadata),
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{
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let mut metadata = self
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.read_by_name(pod_name)?
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.unwrap_or_else(|| PodMetadata::new(pod_name, None));
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update(&mut metadata);
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metadata.pod_name = pod_name.to_string();
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self.write(&metadata)?;
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Ok(metadata)
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}
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/// Set the active pointer while preserving spawned children and manifest snapshot.
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fn set_active(
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&self,
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pod_name: &str,
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active: Option<PodActiveSegmentRef>,
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resolved_manifest_snapshot: Option<serde_json::Value>,
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) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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metadata.active = active;
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metadata.resolved_manifest_snapshot = resolved_manifest_snapshot;
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})
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}
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/// Set spawned-child registry state while preserving active pointer and manifest snapshot.
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fn set_spawned_children(
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&self,
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pod_name: &str,
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children: Vec<PodSpawnedChild>,
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) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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metadata.spawned_children = children;
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})
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}
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/// Set peer visibility state while preserving active pointer, child state,
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/// and manifest snapshot.
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fn set_peers(&self, pod_name: &str, peers: Vec<PodPeer>) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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metadata.peers = peers;
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})
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}
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/// Add one peer if absent while preserving every other metadata field.
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fn add_peer(&self, pod_name: &str, peer_name: &str) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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if !metadata.peers.iter().any(|peer| peer.pod_name == peer_name) {
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metadata.peers.push(PodPeer {
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pod_name: peer_name.to_string(),
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});
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metadata.peers.sort_by(|a, b| a.pod_name.cmp(&b.pod_name));
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}
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})
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}
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/// Remove one peer while preserving every other metadata field.
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fn remove_peer(&self, pod_name: &str, peer_name: &str) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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metadata.peers.retain(|peer| peer.pod_name != peer_name);
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})
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}
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/// Remove reclaimed child delegations from the outstanding set and record
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/// them in durable reclaim history.
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fn reclaim_spawned_children(
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&self,
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pod_name: &str,
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reclaimed: Vec<PodReclaimedChild>,
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) -> Result<PodMetadata, PodStoreError> {
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self.update_by_name(pod_name, |metadata| {
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for reclaimed_child in &reclaimed {
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metadata
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.spawned_children
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.retain(|child| child.pod_name != reclaimed_child.pod_name);
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}
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metadata.reclaimed_children.extend(reclaimed);
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})
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}
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}
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/// Filesystem-backed Pod metadata store.
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#[derive(Clone)]
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pub struct FsPodStore {
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root: PathBuf,
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}
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impl FsPodStore {
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/// Create a store rooted at the Pod-state directory, usually `{data_dir}/pods`.
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pub fn new(root: impl Into<PathBuf>) -> Result<Self, PodStoreError> {
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let root = root.into();
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fs::create_dir_all(&root)?;
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Ok(Self { root })
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}
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fn pod_dir(&self, pod_name: &str) -> Result<PathBuf, PodStoreError> {
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validate_pod_name(pod_name)?;
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Ok(self.root.join(pod_name))
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}
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fn metadata_path(&self, pod_name: &str) -> Result<PathBuf, PodStoreError> {
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Ok(self.pod_dir(pod_name)?.join("metadata.json"))
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}
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}
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impl PodMetadataStore for FsPodStore {
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fn write(&self, metadata: &PodMetadata) -> Result<(), PodStoreError> {
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let path = self.metadata_path(&metadata.pod_name)?;
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if let Some(parent) = path.parent() {
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fs::create_dir_all(parent)?;
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}
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let content = serde_json::to_vec_pretty(metadata)?;
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fs::write(path, content)?;
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Ok(())
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}
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fn read_by_name(&self, pod_name: &str) -> Result<Option<PodMetadata>, PodStoreError> {
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let path = self.metadata_path(pod_name)?;
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let content = match fs::read_to_string(path) {
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Ok(content) => content,
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Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(None),
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Err(err) => return Err(PodStoreError::Io(err)),
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};
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Ok(Some(serde_json::from_str(&content)?))
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}
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fn list_names(&self) -> Result<Vec<String>, PodStoreError> {
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let mut names = Vec::new();
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if !self.root.exists() {
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return Ok(names);
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}
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for entry in fs::read_dir(&self.root)? {
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let entry = entry?;
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if !entry.file_type()?.is_dir() {
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continue;
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}
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if !entry.path().join("metadata.json").exists() {
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continue;
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}
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let Some(name) = entry.file_name().to_str().map(ToOwned::to_owned) else {
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continue;
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};
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if validate_pod_name(&name).is_ok() {
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names.push(name);
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}
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}
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names.sort();
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Ok(names)
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}
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fn root_dir(&self) -> Option<PathBuf> {
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Some(self.root.clone())
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}
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fn delete_by_name(&self, pod_name: &str) -> Result<(), PodStoreError> {
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let path = self.metadata_path(pod_name)?;
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match fs::remove_file(&path) {
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Ok(()) => {}
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Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(()),
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Err(err) => return Err(PodStoreError::Io(err)),
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}
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if let Some(parent) = path.parent() {
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let _ = fs::remove_dir(parent);
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}
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Ok(())
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}
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}
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pub fn validate_pod_name(pod_name: &str) -> Result<(), PodStoreError> {
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if pod_name.is_empty()
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|| pod_name == "."
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|| pod_name == ".."
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|| pod_name.contains('/')
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|| pod_name.contains('\0')
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{
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return Err(PodStoreError::InvalidPodName(pod_name.to_string()));
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}
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Ok(())
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}
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/// Convenience composition for callers that want one handle carrying separate
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/// session-log and Pod-state roots.
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#[derive(Clone)]
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pub struct CombinedStore<S, P> {
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pub session_store: S,
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pub pod_store: P,
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}
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impl<S, P> CombinedStore<S, P> {
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pub fn new(session_store: S, pod_store: P) -> Self {
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Self {
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session_store,
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pod_store,
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}
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}
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}
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impl<S, P> session_store::Store for CombinedStore<S, P>
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where
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S: session_store::Store,
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P: Send + Sync,
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{
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fn append(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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entry: &session_store::LogEntry,
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) -> Result<(), session_store::StoreError> {
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self.session_store.append(session_id, segment_id, entry)
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}
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fn read_all(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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) -> Result<Vec<session_store::LogEntry>, session_store::StoreError> {
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self.session_store.read_all(session_id, segment_id)
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}
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fn list_sessions(&self) -> Result<Vec<SessionId>, session_store::StoreError> {
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self.session_store.list_sessions()
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}
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fn list_segments(
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&self,
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session_id: SessionId,
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) -> Result<Vec<SegmentId>, session_store::StoreError> {
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self.session_store.list_segments(session_id)
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}
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fn lookup_session_of(
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&self,
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segment_id: SegmentId,
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) -> Result<Option<SessionId>, session_store::StoreError> {
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self.session_store.lookup_session_of(segment_id)
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}
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fn create_segment(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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entries: &[session_store::LogEntry],
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) -> Result<(), session_store::StoreError> {
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self.session_store
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.create_segment(session_id, segment_id, entries)
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}
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fn exists(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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) -> Result<bool, session_store::StoreError> {
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self.session_store.exists(session_id, segment_id)
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}
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fn truncate(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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entries_len: usize,
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) -> Result<(), session_store::StoreError> {
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self.session_store
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.truncate(session_id, segment_id, entries_len)
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}
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fn read_entry_count(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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) -> Result<usize, session_store::StoreError> {
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self.session_store.read_entry_count(session_id, segment_id)
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}
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fn append_trace(
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&self,
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session_id: SessionId,
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segment_id: SegmentId,
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entry: &session_store::TraceEntry,
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) -> Result<(), session_store::StoreError> {
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self.session_store
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.append_trace(session_id, segment_id, entry)
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}
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}
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impl<S, P> PodMetadataStore for CombinedStore<S, P>
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where
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S: Send + Sync,
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P: PodMetadataStore,
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{
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fn write(&self, metadata: &PodMetadata) -> Result<(), PodStoreError> {
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self.pod_store.write(metadata)
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}
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fn read_by_name(&self, pod_name: &str) -> Result<Option<PodMetadata>, PodStoreError> {
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self.pod_store.read_by_name(pod_name)
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}
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fn list_names(&self) -> Result<Vec<String>, PodStoreError> {
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self.pod_store.list_names()
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}
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fn root_dir(&self) -> Option<PathBuf> {
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self.pod_store.root_dir()
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}
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fn delete_by_name(&self, pod_name: &str) -> Result<(), PodStoreError> {
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self.pod_store.delete_by_name(pod_name)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn pod_metadata_manifest_snapshot_roundtrips() {
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let mut metadata = PodMetadata::new(
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"profile-pod",
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Some(PodActiveSegmentRef::pending_segment(
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session_store::new_session_id(),
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)),
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);
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metadata.resolved_manifest_snapshot = Some(serde_json::json!({
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"pod": { "name": "profile-pod" },
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"profile": { "source": { "kind": "path", "path": "/profiles/coder.lua" } }
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}));
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let json = serde_json::to_string(&metadata).unwrap();
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let restored: PodMetadata = serde_json::from_str(&json).unwrap();
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assert_eq!(restored, metadata);
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}
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#[test]
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fn fs_store_writes_under_pod_state_root_only() {
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let tmp = tempfile::TempDir::new().unwrap();
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let session_root = tmp.path().join("sessions");
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let pod_root = tmp.path().join("pods");
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fs::create_dir_all(&session_root).unwrap();
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let store = FsPodStore::new(&pod_root).unwrap();
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store
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.write(&PodMetadata::new(
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"agent",
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Some(PodActiveSegmentRef::pending_segment(
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session_store::new_session_id(),
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)),
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))
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.unwrap();
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assert!(pod_root.join("agent/metadata.json").exists());
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assert!(!session_root.join("pods/agent/metadata.json").exists());
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}
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#[test]
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fn active_updates_preserve_children_and_manifest_snapshot() {
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let tmp = tempfile::TempDir::new().unwrap();
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let store = FsPodStore::new(tmp.path()).unwrap();
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let mut metadata = PodMetadata::new("agent", None);
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metadata.spawned_children.push(PodSpawnedChild {
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pod_name: "child".into(),
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socket_path: std::path::Path::new("/tmp/child.sock").into(),
|
|
scope_delegated: vec![],
|
|
callback_address: std::path::Path::new("/tmp/parent.sock").into(),
|
|
});
|
|
metadata.resolved_manifest_snapshot = Some(serde_json::json!({"pod":{"name":"agent"}}));
|
|
store.write(&metadata).unwrap();
|
|
|
|
let snapshot = serde_json::json!({"pod":{"name":"updated"}});
|
|
store
|
|
.set_active(
|
|
"agent",
|
|
Some(PodActiveSegmentRef::active_segment(
|
|
session_store::new_session_id(),
|
|
session_store::new_segment_id(),
|
|
)),
|
|
Some(snapshot.clone()),
|
|
)
|
|
.unwrap();
|
|
let restored = store.read_by_name("agent").unwrap().unwrap();
|
|
assert_eq!(restored.spawned_children.len(), 1);
|
|
assert_eq!(restored.resolved_manifest_snapshot, Some(snapshot));
|
|
}
|
|
|
|
#[test]
|
|
fn child_updates_preserve_active_and_manifest_snapshot() {
|
|
let tmp = tempfile::TempDir::new().unwrap();
|
|
let store = FsPodStore::new(tmp.path()).unwrap();
|
|
let active = PodActiveSegmentRef::active_segment(
|
|
session_store::new_session_id(),
|
|
session_store::new_segment_id(),
|
|
);
|
|
let snapshot = serde_json::json!({"pod":{"name":"agent"}});
|
|
store
|
|
.set_active("agent", Some(active.clone()), Some(snapshot.clone()))
|
|
.unwrap();
|
|
store
|
|
.set_spawned_children(
|
|
"agent",
|
|
vec![PodSpawnedChild {
|
|
pod_name: "child".into(),
|
|
socket_path: std::path::Path::new("/tmp/child.sock").into(),
|
|
scope_delegated: vec![],
|
|
callback_address: std::path::Path::new("/tmp/parent.sock").into(),
|
|
}],
|
|
)
|
|
.unwrap();
|
|
let restored = store.read_by_name("agent").unwrap().unwrap();
|
|
assert_eq!(restored.active, Some(active));
|
|
assert_eq!(restored.resolved_manifest_snapshot, Some(snapshot));
|
|
}
|
|
|
|
#[test]
|
|
fn peer_updates_preserve_active_children_and_manifest_snapshot() {
|
|
let tmp = tempfile::TempDir::new().unwrap();
|
|
let store = FsPodStore::new(tmp.path()).unwrap();
|
|
let active = PodActiveSegmentRef::active_segment(
|
|
session_store::new_session_id(),
|
|
session_store::new_segment_id(),
|
|
);
|
|
let snapshot = serde_json::json!({"pod":{"name":"agent"}});
|
|
store
|
|
.set_active("agent", Some(active.clone()), Some(snapshot.clone()))
|
|
.unwrap();
|
|
store
|
|
.set_spawned_children(
|
|
"agent",
|
|
vec![PodSpawnedChild {
|
|
pod_name: "child".into(),
|
|
socket_path: std::path::Path::new("/tmp/child.sock").into(),
|
|
scope_delegated: vec![],
|
|
callback_address: std::path::Path::new("/tmp/parent.sock").into(),
|
|
}],
|
|
)
|
|
.unwrap();
|
|
store.add_peer("agent", "peer-b").unwrap();
|
|
store.add_peer("agent", "peer-a").unwrap();
|
|
store.add_peer("agent", "peer-a").unwrap();
|
|
|
|
let restored = store.read_by_name("agent").unwrap().unwrap();
|
|
assert_eq!(restored.active, Some(active));
|
|
assert_eq!(restored.spawned_children.len(), 1);
|
|
assert_eq!(restored.resolved_manifest_snapshot, Some(snapshot));
|
|
assert_eq!(
|
|
restored
|
|
.peers
|
|
.iter()
|
|
.map(|peer| peer.pod_name.as_str())
|
|
.collect::<Vec<_>>(),
|
|
vec!["peer-a", "peer-b"]
|
|
);
|
|
|
|
store.remove_peer("agent", "peer-a").unwrap();
|
|
let restored = store.read_by_name("agent").unwrap().unwrap();
|
|
assert_eq!(restored.peers.len(), 1);
|
|
assert_eq!(restored.peers[0].pod_name, "peer-b");
|
|
}
|
|
|
|
#[test]
|
|
fn reclaim_children_removes_outstanding_and_records_history() {
|
|
let tmp = tempfile::TempDir::new().unwrap();
|
|
let store = FsPodStore::new(tmp.path()).unwrap();
|
|
let scope = PodSpawnedScopeRule {
|
|
target: std::path::Path::new("/tmp/delegated").into(),
|
|
permission: "write".into(),
|
|
recursive: true,
|
|
};
|
|
store
|
|
.set_spawned_children(
|
|
"agent",
|
|
vec![PodSpawnedChild {
|
|
pod_name: "child".into(),
|
|
socket_path: std::path::Path::new("/tmp/child.sock").into(),
|
|
scope_delegated: vec![scope.clone()],
|
|
callback_address: std::path::Path::new("/tmp/parent.sock").into(),
|
|
}],
|
|
)
|
|
.unwrap();
|
|
|
|
store
|
|
.reclaim_spawned_children(
|
|
"agent",
|
|
vec![PodReclaimedChild {
|
|
pod_name: "child".into(),
|
|
scope_delegated: vec![scope.clone()],
|
|
}],
|
|
)
|
|
.unwrap();
|
|
let restored = store.read_by_name("agent").unwrap().unwrap();
|
|
assert!(restored.spawned_children.is_empty());
|
|
assert_eq!(restored.reclaimed_children.len(), 1);
|
|
assert_eq!(restored.reclaimed_children[0].scope_delegated, vec![scope]);
|
|
}
|
|
}
|